Open-face runner for slide-rules.



c. FL DIECKM'ANN, OPEN FACE. RUNNER FOR SLIDE RULES.

APPLICATION FILED SEPT. 4. ISH. I 1 1 58,459.

Patented N QY. 2, 1915.

' formed in three layers, the intermediatethat the side UNITED STATES PATENT OFFICE` CARL F. DIECKMANN, OF CHICAGO, ILLINOIS, ASSIGNOR TO EUGENE DIETZGEN COM'.- l

PANY, FACTORY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

OPEN-FACE RUNNER FOR SLIDE-RULES.

Specification of Letters Patent.

Application filed September 4, 1914. Serial No. 860,11H.l

To all whom t may concern.'

Be it known that I, CARL F. DIECKMANN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Open-Face Runners for Slide-Rules, of which the following is a specification. v

My invention relates to runners for slide rules, and the object of the invention is to produce a yrunner in practical commercial form which willaord free vision at the ends of the runner and will afford maximum field of vision and avoid obscuring the figures adjacent to .the marginal edges of the rule. v

vI accomplish my object by the construction shown in the accompanying drawings in which- Figure l is a top or face view of a runner embodying my invention and showing the same in position on a slide rule. Fig. 2 is a view of the runner as in Fig. l but drawn to an increased scale. Fig. 3 is a transverse section of the parts shown in Fig. 2. In this, the preferred form of runner, the glass plate which forms the main body thereof is layer being narrower and consequently affording two marglnal grooves for receiving lthe edges of the side guides. Fig. 4 is 'a transverse section of a modified form of runner in which the body of the runner is formed of a single piece of glass with grooves in the edges formed by sawing or otherwise cutting'away the glass itself. Y In this form the side guides are held in place v Fig. 5 is similar to Fig. 4 except guides instead of being held by cement are formed with a series of pockets or depressions into whichthe glass is pressed while in a plastic condition.

Similar numerals refer to similar parts throughout the several views.

Referring to the formshown in the first three figures of the drawings, the rule itself consists of a body 1 and a slide 2. These are in the usual form. Two parallel marginal grooves 3, 3 are formed inthe edges by cement.

ably made of metal and one of them is -provided with' a spring 5 which bears against lthe edgesf'of the rule for retarding the movement of-utherunner and holding it 1n posio the rule and these receive the lower flanges 4, 4,

tion when set. The side guides are also-pro-v -vided with inwardly extending. flanges 6, 6

which enter marginal grooves in the edges of the runner plate or body. In all forms of my device the runner plate is of glass and at the ends is entirely free from frame work of Vany kind which would tend to obscure the vision. In fact, the plate is thick and strong enough to dispense with all frame work and the side guides are secured directly to it. In

y, the preferred form shown in Fig. 3, theplate 7 consists of three layers, the intermediate one whereof is narrower than the others, thus forming-marginal grooves for receiving the upper ianges 6, 6 of the guides. The

parts are so proportioned that said flanges 6l project little, if any, over the edge of the rule while the plate projects to the edge of the rule if not actually beyond it. The result is that the metal of the side guides does not overlie any appreciable portion of the top surfacev of the rule and substantially the entire upper surface of the rule is visible at all times. For convenience the marginal edges of the plate are beveled at the top to render the device more convenient to handle.

The form of runner shown in Fig. 4 is in all chief respects theF same as in Fig. 8. The difference lis mainly that in this modied form the plate 8 which corresponds with plate .78 is formed of a single piece of glass and the grooves,l or rabbets formed in the marginal edges are produced by sawing er otherwise cuttingraway the material. this form the upper flanges 6 are cemented in place. i

'The form shown in Fig. 5 is the'same as that shown in Fig. 4f, the only difference beratentea Nov. 2, i915..

ing that the upper flanges 6a have a number i From the foregoing 1t will be evident that in my runner there 1s nothing at the ends to obstruct a'view of the face of the rule.

.'All the scales on ,the rule can be read as freely as if the runner lwere absent. As to .the upper and lower marginal edges of the mi runner, the only opaque things are the upper anges f3 of the side guides and with- .respect to these, the Width of the plate is zieh and the side guides are rso formed that the said upper ianges G project but slightly, ii any, over the surface ofthe rule. Consequently, all of the squares on the rule 'can be easily reacl at all times and vet the construc is strong and simple'and the device consists of but three principal parts; to-Wit', the glass plate itself and the two'side guides. Furthermore, as the iianges 6 are lower than they would be if overlying the glass, oier less obstruction to Vision when the rule is viewedV eloliquely from the side. Another i..ipo1tant characteristic of my slide ruie "iewed from practical standpoint is that on account of the iiange and groove connecltion between the plate and the side guides, eementing and welding processes are possible instead of the employment of screws or equivalent fastening elements or the employment of frame pieces running `transversely to the rule and consequently obseuring a portion oi the scales thereof. My construetion therefore makes itpossible to reduce the i number of parts and dispense `with all sur- ,ieseee E eians as new and desire' to semire by Letters 'etent, is 2 in open face ruimer for siicle rules comprising a glass element formed in three sepirate 'layers cemented together the upper and lower iayers being oi? approximately the same Width as elle surface of the rule and the intermediate leyer being appreciably narrower to thereby form grooves in the edges of .the elel'neni'.E and sic-ie guides adapted to engage the raie-, said guides having' flanges entering the grooves in'saicl glass element.

En witness whereof, have hereunto subscribed my name lin the presence of two Witmesses. l

CARL F. DECKMNN.

VJitnesses: i HOWARD M. Cox, KATHRYN S. READY. 

